Depending on your ing. switch && year of your truck some are made to be able to move w/o the keys in them.
As for removing the tumblers, after you insert the pin you need to turn the inj.switch one way or the other & then you should be able to pull it out....Joe
And Quote from delux54panel
"If you have the proper key, it should move the tumbler to all positions." Try to be in the lock (far left) position to remove the cylinder.
Both ZooKeeper and delux54panel are accurate with their info and steering you in the right direction.
I just wanted to add.
If the key is correct for your cylinder tumbler, it should move to all positions. It sounds like either the key is wore down a lot or it is the wrong key. The key may be close, but not exact.
When you turn the key and insert the pin into small hole in face, and then you "feel" the pin depress YOU THEN NEED TO PULL THE PIN OUT EVER SO SLIGHTLY and turn key to left a HALF A HAIR and then depress PIN IN AGAIN.
It sounds to me that the pin is not being depressed fully OR the insides are messed up.
Removing the tumbler can be "fun" without the correct key, or with messed up tumbler, etc, but it can be done with patience and persistence.
Brian